PHYSICS MIDDLE SCHOOL

If a basketball player runs 15 m in a time of 3 s, what was the runners average velocity?

Answers

Answer 1
Answer:

There's not enough information in the question to calculate the player's velocity.  But we can find his average speed.

Speed = (distance covered) / (time to cover the distance)

Speed = (15 meters) / (3 sec)

Speed = (15/3) (m/s)

Speed = 5 m/s

There's no information telling us what direction he ran, so it's not possible to say anything about his velocity.  ('Velocity' is not just a big word for 'speed'.  It's a different thing, and to describe it, you need to know the speed AND the direction of the motion.)

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What is the main function of the nuclus

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Nucleus is known as "the control center of the cell"
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Please answer 72, thank you

Answers

The latitude is three lines north of the equator. Each latitude line is 10 degrees so the latitude is 30 degrees north.
The longitude is three lines west of the Prime Meridian. Each longitude line is 15 degrees. So the longitude is 45 degrees west.

Simple Machine Lever: A ________ that pivots on top of a fixed point called a _______.

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A bar that pivots on top of a fixed point is called a lever.

A push or pull on an object

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a pull because you can get the object

If a hockey puck slides on a perfectly frictionless surface, it willeventually slow down because of its inertia.

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If the surface is perfectly frictionless AND level ... no ups and downs ... then the puck never slows down or stops. There's nothing to make it do so. (Notice that "perfectly frictionless" means no air resistance either.)

In an inverse graph for wavelength versus frequency what are the units of the constant? Would they be (cm/s)/Hz or what?

Answers

Answer: centimeters per second (cm/s)

Explanation:

The relation between the frequency and the wavelenght is:

Velocity = wavelenght*frequency.

So in a relation of wavelenght vs frequency, we will have the relationship:

Where wavelenght is Y and frequency is X

wavelenght = velocity/frequency.

So the constant is the velocity, and we know that the units of the wavelenght is cm, the unit of frequency is Hz (or 1/s), so the units of the velocity is cm/s

Answer:

cm/s

Explanation:

λν=c where λ is the wavelength, ν is the frequency and c is the speed of light.

λ = c/v which is in cm/s/Hz

But we would use just cm! Because that's how we measure the wavelength in this example.

However, the constant is c, the speed of light, which we measure as a speed, so cm/s will do.

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